A Study on Application Electro-Conductive Membranes in Water Purification

研究了将负直流电位应用于错流过滤的中频/超滤膜去除自来水中具有负电位的水相物质和固体的效果。以总有机碳含量为3 mg/L的腐植酸溶液作为膜过滤的模型料液，以5 mg/L叶霉提取的腐植酸为模型料液进行超滤，结果表明，膜过滤对总有机碳和E260的去除效果随外加电位的增加而提高。75 mA时，TOC对中滤膜的去除效率为76%，30 mA时，超滤膜对TOC的去除效率接近100%；75 mA时，E260对中和膜的去除效率为80%。膜的过滤通量不随电位的升高而变化，保持在4m/d左右，而超滤膜的通量随电位的升高而降低，在30 mA时，膜通量几乎达到零m/d。

Effectiveness of application of negative DC electrical potential to electro-conductive MF/UF membranes with cross flow filter was investigated to remove aqueous materials and solids having negative electric potential in raw water of water supply. A solution of humic acids with TOC 3 mg/L was used as model feed solution on MF membrane filter and falvic acids extracted from leaf mold with 5 mg/l was used on UF.The removal efficiency of TOC and E260 in MF and UF membrane filters increased as applied electric potential increased. The removal efficiency of TOC on MF was 76% at 75mA and on UF reached nearly 100% at 30mA.And the removal efficiency of E260 on MF was 80% at 75mA.The filtration flux of MF membrane did not change with electric potential increased and kept 4m/day, but flux of UF membrane decreased with electric potential increased by miropore blockade by bubble of electrolysis and reached nearly zero m/day at 30mA.